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Denver daily news conducted a study,. First, a random sample of nine grocery items was selected. Next, the price of each selected item was checked at each of the three chains on the sames day. Use 0.05 level of significance. What is the decision rule for both.
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
An important idea in data interpretation is choosing which graph to use under which circumstances. Describe the benefits of different graphs for different sets of data:
A researcher wanted to determine the mean number of hours per week (Sunday through Saturday) the typical person watches television. Results from the Sullivan Statistics Survey indicate that s=7.5 hours
Find the 95% confidence interval of the mean score for all golfers if this is a sample of 110 golfers instead of a sample of 93.
Give the expected value and standard deviation of defective shoes in the ShoeFit store order.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Apply the EOQ model to the following quantity discount situation in which D=500 units per year, C0=$40, and the annual holding cost rate is 20%. What order quantity do you recommend?
If the sides of the square are lengthened by 5cm, the area becomes 144cm^2. Find the length of a side of the original square.
A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted in lengths with a standard deviation of 21.1cm.
Formulate a linear programming model for this problem (using QM on Windows and/or Excel on Windows)
What about floor and ceiling effects? How can these issues preclude a significant correlation coefficient from being discovered?
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
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